Speed governor



June 16, 1925. 1,542,080 T. J. MURPHY SPEED GOVERNOR Filed April 3, 1924 Patented .lime 16, 1925.

1,542,0'8'0it 'erom SBEED GLOYERINOBH Application 'led- April, 3,

5 Queens and State-ot .New Yori@have-made f arnlnventioniAppertainingte(a Speed (iov-,i ernor,` Wlxnclninvention i is` fully set forth inl the` tollowinspecahcataoni f lli/ly invention has for @its objectl te1 provide r- I an Yeliicient 'phonognaphespeedg igoizernor vyfor f producing :a i uniform rotation ot ither reeonde tabler at iadjusted-:Speeder Tlejiyinvention ist: applicable to..` phonogenphsiy idrfniena by electric motors tor j by i sp1i1ng;,1notors:, fbnti `fit; V.is` .v particularly admntageouusuV when useda in connertionu Witlic, elentrical dnivenf: phonographswtou; producmgea runitorm rate ot` sneed oft Jdie farinatnre otthe :motor and lalso f@ olii; the reco "el ftablev notwithstandingi any?. inctuationaot the appliech:voltageq` y The `invention ymay ibe contalnednn diller-J ent tornisv ort stnucturesi: To,-fillustmtezf` ai pr :rc-ti cal'` a ppliscation of .the .invention 1 zh are.

seie'etefgl. oneotssnchlstruetures land shalt def scribe @iti hereinatten f The structure `selectin i the accompanying sdrawingi Fi g. 1 1etftlielraxvingsf illustratesV a @top u View of the governor. Fig.V 2, illustrates a E" sectionalvien/ `Fi"gnB lzilhistrates an adjustable member for adjusting a brake member. A supporting plate. 1 is suitably secured in the cabinet of the phonog'aph and, if desired, may be provided with a bearing 2 through which the motor shaft 3 extends. rllhe outer end of the shaft 3 is provided with the usual cone shaped portion 4 for producing a frictional engagement with the record table 5. The plate 1 is provided With lugs or bosses 6 and 7 and the bracket S. In the lug 7 and the bracket 8 are located bearings 9 and 10 in which opposite ends et the shaft or spindle 11 are supported. The bearing 10 is secured in the bracket 8 by a screw 12 While the bearing 9 is movable longitudinally 1n thelug 7 and consequently the spindle 11 is permitted to have a longitudinal movement with the bearing 9. Such movement, however, being suihciently limited to prevent the spindle 11 from leaving the bearing 10. This movement, however, is elastically resisted by means of a spring 13 located between the bearing` 9 and the screw member 14 that is threadedin the lug` 6. The compression of the spring and,

consequentily,-, the l resi-st ance oii theiendithmist J andniovement .of thefspindle 11may `bead,- justedcby `1nea11is-ot thenneniber 11%` i The;-` spindleA 11 "has eat: one endaa Worin 15 1th atmeslies with aiworm i wheel f 16 which 63 is.connected1to1,,themotorashatt 3. The` an-` gle ot `=their meshing; lfgeagin teeth @between the worm and, the Wornifwheel,is sueltasto 'at-r ford-1an ietiicient-u driving, connection! ,for roe tating-the rspindle 11 zandlsor asfto produce 65 a, longitudinali thr-ust against the-u movable 1 bearingft); The smovement. off the bea-ringnisi` i, resisted-by theaspringl. y

The@ divise Ainouenient ;o't`1 thespindle,` 11;,againsty theyielding; resistancey-otwjtheff7G spring 13 is ntilizedctor applyinggra,brakei tothe movement;oii-thelrecord:tablet. 1 The eiiectiveness .of` thel speed regnlatiom iis@ f in if: f proved by i subjectingp` the :1 spindle teV` -a-re-.v sistance to. its frotatio'nifduring the e opera-1 75W ti on ot the f machine, tor prod iice at ,-all times i th,e'conditionfof` some endl thrust -in the :sp-i1 i, dle fto .1 ipreventf i the sudden acceleration otr therarmature and tonnalrathe ispindleyinrits f 1 endwise i movement, ,accurately Airesponsive tor 180.2 ed 'tor the purpose;ofoillustration isfshownfi the,T speed ot grot' tion induced lby @the wenn;z gear. A `it, is@desirnblev-toreleaseethebriafle i com pletely i dnninggdtheiA starting iop rera?,` 2 tion ot ythe1notor inordeiwthat1@theymotorf i mayrnot drawatemlarge startingccurrent ;85W In order to accomplish these 'functions the spindle 11 is provided with a sleeve that slides longitudinally on the spindle. The A sleeve is provided at one end, with a brake disc 18 and the spindle 11 is provided with a collar 19. The disc 18 is secured to the sleeve. 17 and the collar is secured to the spindle. A plurality of resilient metal strips 2O are. secured at one end, in each case, to the collar 19 and at the other end to the moreremote end of the sleeve 17. Suitable Weights 21 are secured to the resilient strips 20. When, therefore, the spindle is rotated. the Weights 21 are rotated AWhich produces a centrifugal force that 100 causes the sleeve 17 to move along the spindle 11 by reason of the distension of the springs 20. This provides 'for a certain" amount ot resistance to the rotation of the spindle 11 to produce asensitive Heating or balanced relation at the normal operating adjusted speeds as determined by the adjustment oi the screw member 111. A brake inemberQQ is supported in the end of an arm 23 that is carried by a rod 24; that rotates in a bearing 25 that is supported on the plate 1. The rod 21 extends angularly to one side of the record table where it is engaged by the end of an adjusting screw 26 that is accessibly located for purposes of adjustment. The end of the rod 24 may be pressed at all times against the adjusting screw 26 by a flat spring screwed to the bottom of the motor board, not shown in the drawing. The bearing 25, that pivotally supports the arm23, is located below the brake member 22 so that when the outer end of the rod 24 is depressed the brake member 22 is moved towards the disc 18. The screw member 2G serves to adjustably locate the rod 24, and, consequently, the brake member 22, to determine the permissible endwise movement of the sleeve 17 before the disc 18 makes contact with the brake member 22. Longitudinal movement of the spindle, beyond a pre-determined point as determined by the adjustment of the screw member 26 moves thefdisc 18 against the brake member 22 to produce a brakeaction on the disc 18 and consequently on the motor and the record table.

In the operation, the disc 18 is away from the brake member 22 so that the motor may be started without any braking action and without any appreciable resistance to its rotation. I/Vhen the motor is in operation the centrifugal action of the weights 21 moves the sleeve 17 along the spindle to produce at all times a braking action of the machine, since there is a certain amount ot' end thrust of the spindle against the bearing 9 and possibly a very slight action as between the brake member 22 and the disc 18. lVhen, however, the motor tends to speed up for any reason, such as in case of an electric ,oso

motor, when there is an increase in voltage, the disc is pressed against the brake member 22 which produces a decided eilective brake action, since the brake member operates along the peripheral portion of the disc. The action of the governor as a whole, therefore, is sensitive and regulates with precision the speed ot' the motor according to the adjustment ot the screw members 14 and 26.

I claim:

1. In a speed governor, the combination of a part to be governed, a rotary element, gear means connecting said part and element to rotate the latter, means supporting said element for rotation and also for axial movement produced by variation in the force transmitted by said gear means, adjustable resilient means resisting said axial movement of said element, centrifugal speed means including a part carried by said element and actuated by said centrifugal means and also by said axial movement olf said element Yfor maintaining the speed ot the latter constant.

2. In a speed governor, the combination of a rotary part to be governed, a governor spindle, gear means connecting said part and spindle for rotating the latter, means supporting said spindle for rotation and also for axial movement produced by variation in the force transmitted by said gear means, and braking means including a part carried by said spindle and actuated by said axial movement thereof for resisting increases ot' speed in the latter.

In testimony whereof I have hereunto signed my name to this specilication.

THOMAS J. MURPHY. 

